Sliding glass door lock

A quick learner from Rosarito Baja, MX says:
I am trying to identify the proper multi-point mortise lock for my sliding glass door.
I have identified my keeper as your part number 82-249.
And, based on the dimensions shown on your website, it looks like both 82-259 and 82-239 will match up to mine.
What is the difference between those two locks?
Thanks
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Lauren from SWISCO responded:

Hello, thank you for posting,

I agree that your parts resemble the products that you have referenced. The only difference between the two locks is the material. The 82-259 is stainless steel. As long as the dimensions are matching up, these parts should be a good fit for you! Please let me know if you have any additional questions! 

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